#Five Words from CET-4
1.stroke [strəʊk]
n.
中风;一击;击球;划水动作；一笔
vt.
划掉;轻抚
Fill in gaps by using short, upward strokes of the pencil.
用铅笔向上短短地勾画几道来填充空白。
She walked forward and embraced him and stroked his tousled white hair.
她走上前拥抱他并轻抚他凌乱的白发。
2.arbitrary [ˈɑ:bɪtrəri]
adj.
乱;随意的，任性的，随心所欲的
Arbitrary arrests and detention without trial were common.
随意逮捕和拘留屡见不鲜。
Language learners'interpretation of pronouns in elliptical constructions is not arbitrary, but restricted by some constraints.
语言习得者对省略句中代词的理
